public void DecorationMouseUp(HitTestValues hit, Point p)
{
NativeMethods.ReleaseCapture();
var pt = new POINTS {
X = (short)p.X, Y = (short)p.Y
};
NativeMethods.SendMessage(Handle, (int)WindowMessages.WM_NCLBUTTONUP, (int)hit, pt);
}
public static extern int PostMessage(IntPtr hwnd, int msg, int wparam, POINTS pos);